Change page style: 


Gemini Remote Access to CFHT ESPaDOnS Spectrograph (GRACES) is the result of a cooperation between the Canada-France-Hawaii Telescope (CFHT), Gemini, and NRC-Herzberg (Canada). It combines the large collecting area of the Gemini North telescope with the high resolving power and high efficiency of the ESPaDOnS spectrograph at CFHT, to deliver high resolution spectroscopy across the optical region. This is achieved through a 270 m fiber optics feed from the Gemini North telescope to ESPaDOnS. The on-sky size of the fiber is 1.2 arcsec.

GRACES performs a maximum resolution power of R ~ 67,500 between 400 and 1,000 nm, with throughput redward of 600 nm comparing those of currently available high-resolution spectrographs in 8-10 m class telescopes. The Gemini Multi-Object Spectrograph (GMOS-N) holds the fiber injector on the Gemini side, and is used for acquiring targets. The GMOS-N On-Instrument Wave Front Sensor (OIWFS) is used for guiding, but the Peripheral WFSs could also be chosen under certain circumstances. On the other end of the fiber, GRACES uses its own slicer bench inside of ESPaDOnS before the light is sent inside the CFHT's echelle spectrograph. For more information about ESPaDOnS, please visit this page at CFHT.

The Instrument Scientist for GRACES is André-Nicolas Chené. Gemini staff who also supports GRACES include Vinicius Placco and Percy Gomez. The CFHT contact for GRACES is Lison Malo.

Important note 

GRACES will be installed and improved over the 2015A semester, and will be offered as Visiting instrument in 2015B.


Mar 5, 2014: GRACES is now offered for the 2015B call for proposals.

NOTE: It was decided to not send a call for System Verification (SV) programs. Future insterested PIs can rather prepare a real proposal for 2015B.

GRACES science highlights

First science data are expected for 2015B. 

How to use these pages

The GRACES pages are organized as follows.



CFHT and Gemini domes next to each other on the Mauna Kea summit (credits Joy Pollard, Gemini/Aura).  

CFHT and Gemini domes next to each other on the Mauna Kea summit (credits Joy Pollard, Gemini/Aura).